user
Tell me how would you respond to the following request.
Give an example of a context-free grammar.

assistant
A simple example of a context-free grammar is the following: 

S → A B
A → C
B → D | E
C → F
D → G
E → G
F → a
G → b

This grammar has one start symbol (S), three non-terminal symbols (A, B and C) and two terminal symbols (a and b). It has two production rules: S → A B, and C → F. This grammar generates strings of symbols of the form a b b.